build-fhs-userenv-bubblewrap: don't bind /etc/fonts from fhs environment

pkgs/build-support/build-fhs-userenv-bubblewrap/default.nix

@@ -80,6 +80,11 @@ let
     if [[ -d ${env}/etc ]]; then
       for i in ${env}/etc/*; do
         path="/''${i##*/}"
+        # NOTE: we're binding /etc/fonts from the host so we don't want to
+        # override it with a path from the FHS environment.
+        if [[ $path == '/fonts' ]]; then
+          continue
+        fi
         ro_mounts+=(--ro-bind "$i" "/etc$path")
       done
     fi